physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Have you ever had a canker sore? If so, you know that these small mouth sores can cause major pain. You can get a canker sore on the inside of your lip or cheek, under your tongue or at the base of your gums. Usually canker sores form one at a time inside your mouth, but you can get more than one in a little cluster.he inside of your mouth is delicate, so mouth injuries, such as biting the inside of your lip or brushing your teeth too hard, also seem to bring on canker sores. But anybody can get a canker sore and they may run in families, which means that if your mom or dad gets canker sores, you might get them, too.